Video: Tus nqi thib kaum yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kev txhais ntawm Kaum - tus nqi txheej
Kaum - tus nqi txheej los yog "TVL" txhais tau hais tias lub thickness ntawm ib tug tshwj xeeb cov ntaub ntawv uas attenuates x-radiation los yog gamma hluav taws xob rau ib tug npaum li cas ntawm cov huab cua kerma tus nqi, raug tus nqi, los yog absorbed koob tshuaj txo mus rau ib tug. thib kaum ntawm tus nqi ntsuas yam tsis muaj cov khoom ntawm tib lub ntsiab lus
Kuj paub, HVL suav li cas?
Txiav txim siab qhov attenuation coefficient ntawm cov khoom. Qhov no tuaj yeem pom hauv lub rooj ntawm attenuation coefficient lossis los ntawm cov chaw tsim khoom ntawm cov khoom. Faib 0.693 los ntawm attenuation coefficient los txiav txim qhov HVL . Ib nrab nqi txheej qauv yog HVL = = 0,693/Μ.
Ib nrab nqi txheej txhais li cas? Ib cov ntaub ntawv ib nrab - tus nqi txheej ( HVL ), los yog ib nrab - tus nqi tuab, yog cov thickness ntawm cov khoom uas qhov kev siv ntawm hluav taws xob nkag mus rau nws yog txo los ntawm ib tug ib nrab.
Yog li ntawd, vim li cas ib nrab nqi txheej tseem ceeb?
Ib nrab nqi txheej . HVL yog ib tseem ceeb Kev tswj xyuas zoo raws li nws yog siv los ntsuas seb puas muaj kev pom txaus hauv lub x-ray beam kom tshem tawm cov hluav taws xob tsawg, uas tuaj yeem ua rau puas tsuaj. Nws tseem yuav pab txiav txim seb hom thiab thickness ntawm shielding xav tau nyob rau hauv qhov chaw.
HVL yog dab tsi hauv hluav taws xob?
Ib nrab nqi txheej ( HVL ) yog qhov dav ntawm cov khoom yuav tsum tau txo cov cua kerma ntawm ib qho x-ray los yog gamma-ray mus rau ib nrab ntawm nws tus nqi qub. Qhov no siv rau nqaim beam geometry nkaus xwb raws li broad-beam geometry yuav muaj kev cuam tshuam loj heev, uas yuav ua rau qis qis qis ntawm qhov attenuation. HVL = 0.693 / Μ
Pom zoo:
Dab tsi yog qhov txawv ntawm ib puag ncig lapse tus nqi thiab adiabatic lapse tus nqi?
A. Ib puag ncig lapse tus nqi yog hais txog qhov kub thiab txias nrog nce qhov siab hauv troposphere; uas yog qhov kub ntawm ib puag ncig ntawm qhov chaw sib txawv. Nws implies tsis muaj huab cua txav. Adiabatic txias tsuas yog cuam tshuam nrog huab cua ascending, uas txias los ntawm kev nthuav dav
Tus nqi plaub ntawm kaum yog dab tsi?
Cov menyuam kawm ntawv yuav tsum teb los ntawm kev sau 104 = 10 x 10 x 10 x 10 = 10,000. Hais tias: Cov khoom 10,000 hu ua lub hwj chim ntawm 10. Lwm lub npe rau kaum txhiab yog 104, uas yog nyeem "kaum mus rau plaub lub zog."
Dab tsi yog ib puag ncig lapse tus nqi thiab adiabatic lapse tus nqi?
Recap • Lapse Rate yog tus nqi uas kub qis dua thaum qhov siab nce hauv huab cua • Ib puag ncig lapse tus nqi yog tus nqi uas kub qis dua thaum tus nqi tsis cuam tshuam los ntawm huab cua saturation • Environmental lapse rate txo sai dua thaum huab cua tsis ruaj khov. tsis ruaj khov
Dab tsi yog qhov flux los ntawm lub voos xwmfab ntawm sab yog tias tus nqi ntawm Q yog ntawm ib qho ntawm nws lub ces kaum?
Raws li peb paub tias, tag nrho cov flux los ntawm tus nqi q yog q / ε 0 (Gauss txoj cai). Yog hais tias tus nqi yog nyob rau ntawm lub ces kaum ntawm lub voos xwmfab, ib co ntawm cov flux nkag mus rau hauv lub voos xwmfab thiab tawm los ntawm ib co ntawm nws lub ntsej muag. Tab sis qee qhov flux tsis nkag mus rau hauv lub voos xwmfab. Qhov 1/8th no yuav muab faib ua 3 ntu dua
Tus qauv qauv yog dab tsi Qhov txawv ntawm tus qauv qauv thiab tus qauv molecular yog dab tsi?
Cov mis mos molecular siv cov cim tshuaj thiab cov ntawv sau npe los qhia cov naj npawb ntawm cov atoms sib txawv hauv cov molecule lossis compound. Ib qho empirical formula muab qhov yooj yim tshaj plaws, tag nrho tus lej piv ntawm atoms hauv ib qho chaw. Cov qauv qauv qhia txog kev sib koom ua ke ntawm cov atoms hauv cov molecule